Search
Search results for
We found
8 results for you
-
Estimating Class A pan evaporation at locations with sparse climatic data
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. Clemence --- , Republic of South AfricaClass A pan evaporation was found to correlate closely with daylength-adjusted maximum daily air temperature (ATM), on a bimonthly basis. ATM and altitude were used as variables in a regression analysis to develop a series of evaporation-estimation equations for various... -
A simple, accurate method of estimating maximum total evaporation from a wheat crop during the daylight period
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.H. van Zyl --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South Africa C.J. Maree --- Department of Agrometeorology, Republic of South AfricaThe use of empirical relationships for the calculation of the energy and aerodynamic components of the Penman-Monteith equation were tested against measured data. Accurate estimates of maximum total evaporation, Em, from a wheat crop were obtained. The empirical equation utilizes... -
Validation of the soil evaporation subroutine of the SWB-2D model in a hedgerow peach orchard
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P Lobit --- Department of Plant Production and Soil Science, NS Mpandeli --- Department of Plant Production and Soil Science, JG Annandale --- Department of Plant Production and Soil Science, NZ Jovanovic --- Department of Earth Sciences, N du Sautoy --- Department Soil Science,The SWB (Soil Water Balance) model, previously developed to estimate water use by agronomic crops, has been adapted to describe solar radiation interception and soil evaporation in hedgerow orchards. The distribution of solar radiation (Rs) at the soil surface is... -
Water use of maize in response to planting density and irrigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. B.O. Ogola --- Department of Plant Production, South Africa T.R. Wheeler --- Department of Agriculture, UK P.M. Harris --- Department of Agriculture, UKThis study aimed to quantify the effect of plant population density and irrigation on the water use efficiency (q) of maize crops, with particular emphasis on the partitioning of water use into transpiration (T) and direct evaporation of water from... -
Predicting the effects of nitrogen and planting density on maize water use in semi-arid Kenya
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. B.O. Ogola --- Department of Plant Production, South Africa T.R. Wheeler --- Department of Agriculture, U.K. P.M. Harris --- Department of Agriculture, U.K.Models are important tools to assess the scope of management effects on crop productivity under different climatic and soil regimes. Accordingly, this study developed and used a simple model to assess the effects of nitrogen fertiliser and planting density on... -
Experimental study of an optimised solar still type with two condensing compartments suitable for alcoholic distillation
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Siaka Touré --- Laboratoire d'Energie Solaire, Côte d'Ivoire Dobet Dago N'Drin --- Laboratoire d'Energie Solaire, Côte d'Ivoire Hassan Salami --- Laboratoire d'Energie Solaire, Côte d'Ivoire Modibo Sidibé --- Laboratoire d'Energie Solaire, Côte d'Ivoire Diakaridja Traoré --- Laboratoire d'Energie Solaire, Côte d'IvoireAn optimised solar still prototype suitable for alcoholic distillation was designed and tested. Its design is different from the single slope conventional solar still. It consists of two compartments which are in communication by a slit. One of the two... -
Quantification of primary salinity, sodicity and alkalinity in South African soils using climate regions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J Piet Nell --- Agricultural Research Council–Institute for Soil, South Africa Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Science, South AfricaNo reliable primarily salinity, sodicity and alkalinity information is available for South Africa, nor are there monitoring programs in place to track the salt-affected status of South African soils. Such information is, however, needed for various agricultural and environmental studies... -
Impacts of a concentrated solar power trough facility on birds and other wildlife in South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Corey Jeal --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Vonica Perold --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Samantha Ralston-Paton --- BirdLife South Africa, South Africa Peter G Ryan --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South AfricaThis study assesses bird and wildlife mortality and changes in bird species communities at a 50 MW utility-scale concentrated solar power parabolic trough facility in South Africa. The facility was searched for evidence of large vertebrate mortalities over three months...